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PDF STCF04TBR Data sheet ( Hoja de datos )
| Número de pieza | STCF04TBR | |
| Descripción | High power white LED SuperCap driver | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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STCF04
High power white LED SuperCap driver with I²C interface
Data brief
Features
■ 1.8 MHz buck-boost converter with 1.2 A peak
current limiting and synchronous rectification
■ Programmable current limit
■ Burst mode operation when output is charged
■ Selectable 200 mA / 400 mA SuperCap
charging current
■ Input voltage range 2.7 V to 5.5 V
■ Programmable output charging voltage up to
5.5 V
TFBGA25 (3 x 3 mm.)
Applications
■ Full I²C control
■ Operation modes:
– Shutdown mode
– Monitoring mode with NTC and SuperCap
monitoring
– Idle mode
– Flash mode
– Torch mode: up to 300 mA
■ Controlled LED current in all modes
■ Soft and hard triggering of flash, torch and
picture light modes
■ Torch dimming in 12 exponential steps
■ Flash dimming in 8 steps
■ Torch mode safety time-out
■ Active balancing of SuperCap voltage
■ SuperCap status flag
■ Internally or externally timed flash operation
■ Digitally programmable safety time-out in flash
mode
■ LED overtemperature detection and protection
with external NTC resistor
■ Cell phones and smartphones
■ Camera flash/strobe
■ PDAs and digital still cameras
Description
The STCF04 is a dedicated and space optimized
high efficiency solution for driving a flash LED
module in camera phones, PDAs and other hand-
held devices using the SuperCap technology. It is
based on a DC-DC buck-boost converter, which
ensures proper and efficient charging control and
monitoring of the SuperCap within the entire
battery voltage range. The output current control
ensures good current regulation over the forward
voltage spread characteristics of the flash LEDs in
torch and flash mode operation. The SuperCap
charging current is programmed to a defined
value which avoids overload of the battery. The
SuperCap discharge current flows through the
LEDs and the external MOSFET which must be
chosen according to the desired flash current.
See Description (continued).
■ Shorted LED failure detection and protection
■ Chip overtemperature detection and protection
Table 1. Device summary
Order code
Package
Packaging
STCF04TBR
TFBGA25 (3 x 3 mm.)
3000 parts per reel
March 2009
Rev 1
For further information contact your local STMicroelectronics sales office.
1/7
www.st.com
7
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1 page  
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Package mechanical data
STCF04
Dim.
A
C
D
N
T
Ao
Bo
Ko
Po
P
Tape & reel TFBGA25 mechanical data
Min.
12.8
20.2
60
3.9
7.9
mm.
Typ.
3.3
3.3
1.60
Max.
330
13.2
14.4
4.1
8.1
Min.
0.504
0.795
2.362
0.153
0.311
inch.
Typ.
0.130
0.130
0.063
Max.
12.992
0.519
0.567
0.161
0.319
5/7
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5 Page | ||
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